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Yaskawa drives and servopacks are the backbone of modern industrial automation. Known for their robustness and precision, they are the silent workhorses of robotics, CNC machining, and conveyor systems. However, even the most reliable hardware encounters faults. Among the many alphanumeric codes that can flash on a Yaskawa digital operator, Error Code A910 stands out as one of the most misunderstood—and critically important—alerts.
If you have searched for "Yaskawa error code A910 exclusive," you are likely not looking for basic troubleshooting. You need the deep, technical breakdown that service manuals gloss over. This article provides that exclusive, in-depth analysis. We will cover what A910 really means, why standard fixes fail, and the proprietary nuances Yaskawa engineers expect you to know.
In the world of industrial automation, Yaskawa drives (specifically the GA800, GA700, A1000, and U1000 series) are known for their reliability. However, when an error code appears, it demands immediate attention. Among the various alarms, Error Code A910 stands out as particularly “exclusive” due to its specific cause: it is a hardware-exclusive alarm related to the drive’s charging circuit.
To avoid the exclusivity of an A910 shutdown:
Do NOT disable undervoltage detection by setting L2-05 = 0. This will cause catastrophic failure of the drive's IGBT module when a real power loss occurs, leading to a non-repairable PGo or GF fault.
If you have a specific Yaskawa model (e.g., GA800, A1000, V1000), reply with the model number and the load type (fan, pump, conveyor, crane) for a tailored parameter list.
In the world of high-precision industrial automation, encountering a fault can bring productivity to a grinding halt. If your Yaskawa Sigma-7 Go to product viewer dialog for this item. or Go to product viewer dialog for this item.
series servo drive is displaying A.910, you are seeing an Overload Warning.
While this isn't a hard "fault" that will immediately trip the drive, it is an urgent alert that the system is operating dangerously close to its thermal or mechanical limits. Ignoring an A.910 warning typically leads to an A.710 (Overload: High Load) or A.720 (Overload: Low Load) fault, which will shut down your motor to prevent permanent damage. What Does the A.910 Error Code Mean?
The A.910 code indicates that the drive's internal algorithms have detected an operation that exceeds the rated overload protection characteristics of the motor. Essentially, the drive is "warning" you that if current conditions continue, the motor or the SERVOPACK will overheat. Common Causes of the A.910 Alarm
Understanding why this warning appears is the first step toward a permanent fix. Common culprits include:
Excessive Mechanical Load: Friction in the bearings, a jammed conveyor, or a misaligned gearbox can force the motor to draw more current than intended.
Aggressive Motion Profiles: Rapid acceleration and deceleration cycles that exceed the motor's duty cycle will trigger this warning.
Wiring Issues: Poor contact or incorrect wiring between the SERVOPACK and the motor or encoder can cause erratic readings or inefficient power delivery.
Incorrect Parameter Settings: The overload warning level is defined by parameter Pn52B. If this is set too low for your specific application, you may get "nuisance" alarms.
Ambient Temperature: High temperatures inside the electrical panel (above
) reduce the drive's ability to dissipate heat, leading to premature overload warnings. Step-by-Step Troubleshooting Guide
If you are facing an A.910 error, follow these steps to diagnose and resolve the issue: 1. Inspect the Mechanical System
Before diving into software, check the hardware. Disconnect the motor from the load and rotate the shaft by hand. If you feel resistance or "binding," the problem is mechanical. Lubricate joints, check belt tension, and ensure there are no obstructions in the machinery. 2. Verify Wiring Integrity yaskawa error code a910 exclusive
Ensure all connections at the U, V, and W terminals are tight. Check the encoder cable for any signs of damage or interference. Poor encoder signals can cause the drive to "hunt" for position, increasing the current draw and triggering an overload. 3. Adjust Operating Conditions
If the mechanical system is clear, look at your cycle times. Try reducing the acceleration/deceleration rates or the total duty cycle. You can use the Yaskawa SigmaWin+ software to monitor the Effective Torque Reference to see exactly how hard the motor is working. 4. Check Parameter Pn52B
By default, the A.910 warning is often set to trigger when the load reaches 20% of the maximum overload capacity. If your application naturally runs "hot" but within safe limits, you may need to increase the value of Pn52B (Overload Warning Level) to a more suitable percentage. 5. Environmental Control
Ensure your control cabinet has proper ventilation. If the drive's internal fan has failed, you will see a FAn alarm or an A.910 warning as the heatsink temperature rises. If the fan is clogged, use compressed air to clean the heatsink fins. When to Replace the Hardware
If you have verified the wiring, parameters, and mechanical load, and the A.910 warning persists even when the motor is disconnected, the Go to product viewer dialog for this item.
itself may have a faulty current detection circuit. In these cases, the internal board may require repair or replacement from an authorized center like Precision Zone. Yaskawa GA700 Manual Fault Codes Explained & Solutions
The Yaskawa A.910 error code is an Overload Warning on Yaskawa Sigma-series servo drives (specifically Sigma-3, Sigma-5, and Sigma-7). It is a warning, not a hard fault, meaning the drive is detecting that it is operating near its thermal limit and is about to trigger a hard "A.710" or "A.720" overload trip. 🛠️ Common Causes
Mechanical Bind or Jam: Excessive load caused by friction, worn bearings, or physical obstructions in the machine.
Poor Wiring/Contact: Faulty or loose connections in the motor or encoder cables can cause irregular current spikes.
Under-sized Motor: The operating conditions (torque or speed) exceed the rated capacity of the servomotor.
High Ambient Temperature: If the control panel temperature exceeds 55°C (131°F), the drive cannot dissipate heat effectively.
Incorrect Warning Levels: The parameter Pn52B (Overload Warning Level) may be set too low for the intended application. 🔍 Troubleshooting Steps 1 Check Mechanicals
Disconnect the motor from the load and rotate the shaft by hand to check for binding. 2 Verify Wiring
Inspect U, V, and W power leads and the encoder cable for secure seating and damage. 3 Monitor Torque
Use SigmaWin+ to monitor the "Effective Torque Reference." It should ideally stay below 100%. 4 Check Environment
Ensure cabinet fans are working and internal temperatures are below 55°C. 5 Adjust Pn52B
If the load is naturally high but safe, increase the value of parameter Pn52B to delay the warning. 💡 Pro Tip: Is it a CPU Error?
If you are seeing 0910 on a Yaskawa Motoman Robot controller (like the Go to product viewer dialog for this item. Decoding Yaskawa Error Code A910: The Exclusive Guide
), this is a CPU Error rather than a drive overload. This usually indicates a failure in the CPU unit or communication between boards and may require a hardware replacement or software re-installation. To help narrow this down, could you tell me: What model of Yaskawa hardware are you using (e.g., Sigma-7 drive Go to product viewer dialog for this item. , Motoman robot)?
Does the error happen immediately at power-up or only during movement? Have there been any recent mechanical changes or crashes? FS100 ALARM CODE 0910 CPU ERROR (CPU-201R)
In Yaskawa servo drive systems, the code is classified as an Overload Warning
. Unlike a hard fault, a warning indicates that the system is approaching an operational limit but has not yet tripped a protective shutdown. Understanding the A.910 Warning
The A.910 warning specifically serves as a "pre-alarm" for more severe overload conditions. It is designed to alert operators before the drive triggers the following fatal alarms: : Overload – High Load. : Overload – Low Load. Yaskawa America
If the conditions causing A.910 are ignored and operation continues, the drive will eventually shut down with one of the above errors to protect the motor and internal circuitry. Common Causes Excessive Load
: The torque required by the application is consistently exceeding the motor's rated capacity. High Ambient Temperature : If the environment around the motor or drive exceeds
), the system's ability to dissipate heat is reduced, leading to premature overload detection. Mechanical Issues
: Increased friction in the mechanical system—such as worn bearings, jammed gears, or lack of lubrication—forces the motor to work harder than normal. Incorrect Gain Settings
: Aggressive servo gain settings can cause the motor to "hunt" or vibrate, drawing excessive current and triggering an overload warning. MachMotion Troubleshooting and Solutions Check Load Ratios : Use the monitor function (typically
for accumulated load ratio) to verify the actual percentage of the motor's capacity being used. If it is consistently near or above 100%, the application may require a larger motor or a change in duty cycle. Verify Environment
: Ensure that the cooling fans on the drive are functional and that there is adequate ventilation in the control cabinet. Inspect Mechanics
: Disconnect the motor from the load and check if the mechanical components move freely by hand. Tune the Servo : If vibration is present, use the Yaskawa SigmaWin+ software
to perform autotuning or manually adjust gains to stabilize the system.
For detailed technical specifications, you can refer to the official Yaskawa Sigma-5 Alarm Troubleshooting Guide MachMotion Drive Error List specific parameter settings for your drive model to adjust these warning thresholds?
Troubleshooting Yaskawa Error Code A.910: A Comprehensive Guide Yaskawa A.910 error code , specifically associated with the Sigma-7 series servo drives Overload Warning
. Unlike critical "faults" that immediately shut down the system, this is an alarm indicating the motor is operating near its capacity limit and is at risk of a full overload trip (A.710 or A.720). Understanding the A.910 Alarm
This alarm serves as a proactive signal. When your drive displays A.910, it means the current load or operating conditions are pushing the servomotor toward its thermal protection threshold. Primary Causes & Diagnostic Steps Put the machine in a safe state: stop
To resolve the A.910 code, inspect these five common triggers identified in Click2Electro's Sigma 7 Guide Mechanical Load Issues
: The most common culprit is excessive physical load. Check the motor and connected machinery for physical obstructions, worn parts, or misalignment. Wiring and Contact Faults
: Incorrect or loose wiring between the servomotor and the encoder can trigger false warnings or legitimate performance drops. Operating Condition Violations
: Rapid acceleration/deceleration cycles or continuous high-torque operation can exceed the drive's overload protection characteristics. Parameter Configuration Overload Warning Level (Pn52B)
is set too low for your specific application, the drive will trigger A.910 prematurely. Hardware Failure : In rare cases, internal failure within the
itself may lead to incorrect current sensing and false alarms. Effective Remedies to Clear A.910 Follow these steps to restore normal operation: Inspect Mechanics
: Verify that the load is within the motor's rated capacity and that there are no mechanical jams. Check Wiring
: Ensure all connections for the servomotor and encoder are secure and correctly mapped according to the Yaskawa Sigma-7 manual Adjust Parameters : Check parameter
. If your process naturally requires high loads, ensure this setting is appropriate for your workload without compromising safety. Evaluate Motor Capacity
: If the alarm persists during standard operation, you may need to increase the motor capacity to handle the specific application requirements. Replace SERVOPACK
: If the hardware is identified as faulty after all other checks, the unit may need professional repair or replacement.
: You can often find additional details on current alarms by checking the seven-segment display on the front of the drive or using the software for a more detailed diagnostic readout. or a list of compatible Sigma-7 motor upgrades A.910 fault in Yaskawa Sigma 7 servo drive - Click2Electro
Based on Yaskawa documentation (specifically for the GA500, GA700, A1000, and V1000 series drives), Error Code A910 indicates an Overload Warning.
Here is the exclusive breakdown of the error, its causes, and the solution steps.
This occurs frequently during commissioning. The drive is receiving conflicting commands regarding who is the "Master."
o2-01 (or similar depending on series) which dictates the frequency reference source and run command source.If you encounter A910, follow this exclusive checklist:
Input Power Supply Issues (90% of cases)
DC Bus / Rectifier Issues
Load Related (High inertia + short decel)